KEITHVILLE, La. — For the first time in their lives, four aging chimpanzees once used in federal research can go outside whenever they like. They can lie on the grass, clamber onto a platform 20 feet up on a chimp-style jungle gym and gaze freely at the open sky, the vista unbroken by steel bars.

Fifty-two-year-olds Julius and Sandy, 46-year-old Phyllis and 44-year-old Jessica have arrived. These and several other primates are now “living like chimpanzees” as they play, groom each other and tussle at Chimp Haven in northwest Louisiana — the only national sanctuary for retired federal research chimps.

Julius’ group is among 111 chimpanzees coming to Chimp Haven over the next 18 months from the University of Louisiana at Lafayette’s New Iberia Research Center. They could be the vanguard of a much larger immigration of former research chimps on the way to the refuge in Keithville, La.

A National Institutes of Health committee recommended Jan. 22 that most of the other 350 federally owned research chimpanzees be retired to “the federal sanctuary system” — a system of one.

The agency’s director will decide whether to accept the recommendations after a 60-day period for public comment.

The proposal to retire all but about 50 federally owned chimpanzees is the latest step in a gradual shift away from using chimps as test subjects, owing to technological advances and growing ethical concerns about research on primates that share more than 98 percent of the DNA of humans.

Research on the chimps has ranged from psychological studies to trying to develop vaccines for HIV and hepatitis.

The arrivals are staggered so the small staff can integrate small groups of newcomers with old-timers at Chimp Haven. And some of their living quarters and play spaces haven’t yet been built at Chimp Haven, which opened in 2005.

The newcomers led by Julius were among nine that arrived Jan. 22. Another seven arrived later that week and eight more Tuesday, Feb. 19.

Julius and his “girls” got their first view of unobstructed sky last week. New arrivals spend 17 days in quarantine before being moved into an indoor bedroom area near a bedroom occupied by chimps already settled into the sanctuary, to see how they get along.

Their first outdoor time is in one of two grassy, quarter-acre play yards that open onto the bedrooms. A network of steel mesh tunnels lets the staff move chimps from any part of the sanctuary to any other.

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